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Response Time for UIButton

I developed a test for iPod / iPhone (with MonoTouch support, if so) that measures reaction time. But I need to consider the time between touching the screen and actually triggering the button event. Are there any documents about this?

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It is almost impossible to get a predictable interrupt delay in real-time operating systems.

But on the iPhone? IMHO impossible. A capacitive touch screen is not optimal for obtaining results that are the same for each body and location. And if mail.app decides to poll emails, then the moment you touch the screen, there will be a big delay.

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